Car Problem Reports

Mitsubishi Diamante Coolant Leak From Heater Core

Mitsubishi Diamante Problem
25 Reports
Me Too

Model Years Affected: 1998, 1999, 2000, 2001, 2002, 2003, 2004

Average Mileage: 89,851 mi (45,000 mi - 187,000 mi)


A coolant leak may develop from the heater core, requiring replacement of the heater core.

  • Visitor, , 70,100 mi

    The problem is the heater core and I want to know if it has been on recall. 2003 Mitsibushi Galant

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  • Visitor, , 45,000 mi

    Replaced radiator, but slow coolant leak reoccurred after few months. Foggy front windows, smell of coolant, empty radiator, slight engine overheating. Returned to same mech who replaced radiator, they pressure test and leak check but could not find anything obvious. Finally they diagnosed heater coil leak inside dash. Expensive job to fix, at least $1K. Debating worth it on 12+ year old car, which is otherwise in fantastic driving condition.

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  • Visitor, , 99,673 mi

    i was driving the car after cleaning it and the floor felt wet so i pulled the mat up and it was damp so i pulled the plastic off under the glove box and felt a lot of condonsation on the white box around the heater core

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  •  Rookie

    syrupy smell, foggy front window, soaked passenger carpet

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  • Visitor, , 80,000 mi

    I noticed a sweet smell coming from heater, call dealer and he said that it was the heater core. He also said that it's a problem in most Diamantes. I ask if there was a recall, told me no :( I put stop leak in the radiator for now

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  •  Rookie

    lots of film on windshield hard to see and hard to get off.
    Hard to breath with windows closed. Any Recalls on this problem? Very expensive to repair.

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  • Visitor, , 75,000 mi

    heater core had to be replaced

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  • Visitor, , 54,000 mi

    Replaced Heater Core

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  • Visitor, , 90,000 mi

    coolant leak from heater core. returned to dealer. at the time i had a extended warranty that covered the parts and service.

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  • over heating in the heater core system an leakin like hell after travalling 5 km??

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